[launchd-dev] Launch on demand from kernel extension?

Hello, I have an OS X kernel extension that has settings that need to be saved and restored (the settings are not per-user). Since a kernel extension cannot read/write a preference file, I have a helper daemon that interfaces with my kext and handles the reading/writing of the preference file. I have recently converted over from using StartupItems to using launchd to launch my helper daemon at startup. Is it possible, using launchd, to have my kernel extension launch the helper daemon on demand? If so, what is the best way to implement this? I need to support OS X 10.4.11 and above. cheers, colin